﻿    <p>
      The <em>IfcAxis2Placement2D</em> provides location and
      orientation to place items in a two-dimensional space. The
      attribute <em>RefDirection</em> defines the x axis, the y
      axis is derived. If the attribute <em>RefDirection</em> is
      not given, the placement defaults to P[1] (x-axis) as [1.,0.]
      and P[2] (y-axis) as [0.,1.].
    </p>
    <table>
      <tr>
        <td>
          <img src="../../../figures/ifcaxis2placement2d-layout1.gif" alt=
          "axis2 placement 2D" width="400" height="300" border="0">
        </td>
        <td style="vertical-align:bottom">
          <blockquote class="note">
            Figure 2 illustrates the definition of the
            <em>IfcAxis2Placement2D</em> within the two-dimensional
            coordinate system.
          </blockquote>
        </td>
      </tr>
      <tr>
        <td>
          <p class="figure">Figure 2 &mdash; Axis2 placement 2D</p>
        </td>
        <td>
          &nbsp;
        </td>
      </tr>
    </table>
    <blockquote class="extDef">
      NOTE&nbsp; Definition according to ISO/CD 10303-42:1992<br>
      The location and orientation in two dimensional space of two
      mutually perpendicular axes. An axis2_placement_2d is defined
      in terms of a point, (inherited from the placement
      supertype), and an axis. It can be used to locate and
      originate an object in two dimensional space and to define a
      placement coordinate system. The entity includes a point
      which forms the origin of the placement coordinate system. A
      direction vector is required to complete the definition of
      the placement coordinate system. The reference direction
      defines the placement X axis direction, the placement Y axis
      is derived from this.
    </blockquote>
    <blockquote class="note">
      NOTE&nbsp; Entity adapted from
      <strong>axis2_placement_2d</strong> defined in ISO 10303-42.
    </blockquote>
    <blockquote class="history">
      HISTORY&nbsp; New entity in IFC1.5.
    </blockquote>